Galilei, Galileo, The systems of the world, 1661

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    <archimedes>
      <text>
        <body>
          <chap>
            <pb xlink:href="065/01/148.jpg" pagenum="140"/>
            <p type="main">
              <s>SIMP. </s>
              <s>The top will run reeling along the floor towards that
                <lb/>
              part whither its upper parts encline it.</s>
            </p>
            <p type="main">
              <s>SAGR. </s>
              <s>And why not whither the contrary parts tend, namely,
                <lb/>
              thoſe which touch the ground?</s>
            </p>
            <p type="main">
              <s>SIMP. </s>
              <s>Becauſe thoſe upon the ground happen to be impeded
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              by the roughneſs of the touch, that is, by the floors unevenneſs;
                <lb/>
              but the ſuperiour, which are in the tenuous and flexible air, are
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              hindred very little, if at all; and therefore the top will obey their
                <lb/>
              inclination.</s>
            </p>
            <p type="main">
              <s>SAGR. </s>
              <s>So that that taction, if I may ſo ſay, of the neither
                <lb/>
              parts on the floor, is the cauſe that they ſtay, and onely the upper
                <lb/>
              parts ſpring the top forward.</s>
            </p>
            <p type="main">
              <s>SALV. </s>
              <s>And therefore, if the top ſhould fall upon the ice, or
                <lb/>
              other very ſmooth ſuperficies, it would not ſo well run forward, but
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              might peradventure continue to revolve in it ſelf, (or ſleep)
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              out acquiring any progreſſive motion.</s>
            </p>
            <p type="main">
              <s>SAGR. </s>
              <s>It is an eaſie thing for it ſo to do; but yet
                <lb/>
              leſs, it would not ſo ſpeedily come to ſleep, as when it falleth on
                <lb/>
              a ſuperficies ſomewhat rugged. </s>
              <s>But tell me,
                <emph type="italics"/>
              Simplicius,
                <emph.end type="italics"/>
              when
                <lb/>
              the top turning round about it ſelf, in that manner, is let fall, why
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              doth it not move forwards in the air, as it doth afterwards when it
                <lb/>
              is upon the ground?</s>
            </p>
            <p type="main">
              <s>SIMP. </s>
              <s>Becauſe having air above it, and beneath, neither thoſe
                <lb/>
              parts, nor theſe have any where to touch, and not having more
                <lb/>
              caſion to go forward than backward, it falls perpendicularly.</s>
            </p>
            <p type="main">
              <s>SAGR. </s>
              <s>So then the onely reeling about its ſelf, without other
                <lb/>
                <emph type="italics"/>
              impetus,
                <emph.end type="italics"/>
              can drive the top forward, being arrived at the ground,
                <lb/>
              very nimbly. </s>
              <s>Now proceed we to what remains. </s>
              <s>That laſh,
                <lb/>
              which the driver tyeth to his Top-ſtick, and with which, winding
                <lb/>
              it about the top, he ſets it (
                <emph type="italics"/>
              i. </s>
              <s>e.
                <emph.end type="italics"/>
              makes it go) what effect hath it on
                <lb/>
              the ſaid top?</s>
            </p>
            <p type="main">
              <s>SIMP. </s>
              <s>It conſtrains it to turn round upon its toe, that ſo it may
                <lb/>
              free it ſelf from the Top-laſh.</s>
            </p>
            <p type="main">
              <s>SAGR. </s>
              <s>So then, when the top arriveth at the ground, it cometh
                <lb/>
              all the way turning about its ſelf, by means of the laſh. </s>
              <s>Hath it
                <lb/>
              not reaſon then to move in it ſelf more ſwiftly upon the ground,
                <lb/>
              than it did whilſt it was in the air?</s>
            </p>
            <p type="main">
              <s>SIMP. </s>
              <s>Yes doubtleſs; for in the air it had no other impulſe
                <lb/>
              than that of the arm of the projicient; and if it had alſo the
                <lb/>
              ing, this (as hath been ſaid) in the air drives it not forward at all:
                <lb/>
              but arriving at the floor, to the motion of the arm is added the
                <lb/>
              progreſſion of the reeling, whereby the velocity is redoubled. </s>
              <s>And
                <lb/>
              I know already very well, that the top skipping from the ground,
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              its velocity will deminiſh, becauſe the help of its circulation is
                <lb/>
              wanting; and returning to the Earth will get it again, and by that </s>
            </p>
          </chap>
        </body>
      </text>
    </archimedes>
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